CN103414210B - A kind of photovoltaic grid-connected device based on SOPC - Google Patents
A kind of photovoltaic grid-connected device based on SOPC Download PDFInfo
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- CN103414210B CN103414210B CN201310331526.3A CN201310331526A CN103414210B CN 103414210 B CN103414210 B CN 103414210B CN 201310331526 A CN201310331526 A CN 201310331526A CN 103414210 B CN103414210 B CN 103414210B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a kind of photovoltaic grid-connected device based on SOPC, be mainly made up of main circuit, Hall element, signal conditioning circuit, analog-digital converter, testing circuit, FPGA control module, drive circuit.The present invention by carrying out the improvement in structure to existing photovoltaic grid-connected device, efficiently solve that existing photovoltaic grid-connected device system response time is slow, tracking accuracy is low, poor dynamic, or can not be difficult to realize in-system programming, system job stability and poor anti jamming capability, system inefficiency, bulky problem.
Description
Technical field
The invention belongs to solar photovoltaic technology field, relate to a kind of photovoltaic grid-connected device based on SOPC.
Background technology
Solar energy cleaning, environmental protection, inexhaustible, nexhaustible, it is the important directions of future source of energy development.In order to more preferably,
More convenient, more effectively utilize solar energy, need the electric energy that solar energy is sent be incorporated to share electrical network, create grid-connected dress
Put.Up to now, in order to realize the grid-connected of photovoltaic generation electric energy, the solution often selected is to use special ASIC, list
Sheet machine and digital signal processor DSP etc..
Prior art has following defects that system response time is slow, tracking accuracy is low, poor dynamic, Bu Nenghuo mostly
It is difficult to realize in-system programming, system job stability and poor anti jamming capability, system inefficiency, bulky.
Summary of the invention
In order to solve that existing photovoltaic grid-connected device system response time is slow, tracking accuracy is low, poor dynamic, can not or not
Easily realize in-system programming, system job stability and poor anti jamming capability, system inefficiency, bulky problem,
The invention provides a kind of photovoltaic grid-connected device based on SOPC.Its technical scheme is as follows:
A kind of photovoltaic grid-connected device based on SOPC, mainly by main circuit, Hall element, signal conditioning circuit, modulus
Transducer, testing circuit, FPGA control module, drive circuit are constituted:
The core of described main circuit is a full-bridge inverter, and the wide scope unidirectional current mainly completing to export photovoltaic array is inverse
Become sinusoidal ac to realize and the coupling of electrical network；
Described Hall element is for gathering DC voltage and DC side reference instruction voltage, the inversion of photovoltaic array output
The alternating current of device output, line voltage etc. are also sent into signal conditioning circuit and are processed；
Described signal conditioning circuit mainly completes the conditioning to sampled signal；
Described analog-digital converter realizes that collection conditioned analogue signal are converted to digital signal and sends into FPGA control
Module；
Described testing circuit is for catching the zero crossing of mains voltage signal, and guarantees that inverter exports through phase-locked loop circuit
Electric current follows the tracks of electrical network electricity Phase synchronization with it；
Described FPGA control module is whole device control centre, completes following control work:
The control of outside A/D converter sequential and the storage of conversion data, it is ensured that when A/D converter is according to certain work
Ordered pair external analog signal is changed；
All-digital phase-locked loop control work, it is ensured that the electric current that photovoltaic parallel in system is exported and line voltage remain same
Frequency same phase；
Produce for building grid-connected current waveform or for building the Active frequency drift detection side needed for island effect protection
The current waveform of method；
Produce the pwm signal of band Dead Time, it is ensured that what outside full-bridge circuit can be orderly is operated, and will not occur
Upper and lower bridge arm shoot through phenomenon；
Complete the realization of control algolithm, it is ensured that whole system works under set control strategy in order；
Complete the clock distribution work of each module of whole system, control SOPC based on NiosII embedded software core processor
System, it is ensured that each sub-module of system all works under the control of clock in an orderly manner；
Described drive circuit, for receiving the output of pwm signal generating unit in FPGA, controls merit in main circuit inverter
The turn-on and turn-off of rate MOSFET.
Further preferably, described photovoltaic grid-connected device uses full bridge inverter as system capacity conversion and control core
The heart, and use the Direct Current PI control strategy of a kind of band electrical network voltage feedforward control, it is provided with based on FPGA realization digital
Phase-locked loop control circuit.
Further preferably, the FPGA control module of described photovoltaic grid-connected device uses VHDL language programming, at fpga chip
In complete following work:
The control of outside A/D converter sequential and the storage of conversion data, it is ensured that when A/D converter is according to certain work
Ordered pair external analog signal is changed；
All-digital phase-locked loop control work, it is ensured that the electric current that photovoltaic parallel in system is exported and line voltage remain same
Frequency same phase；
Produce for building grid-connected current waveform or for building the Active frequency drift detection side needed for island effect protection
The current waveform of method；
Complete the PWM signal generator work of band Dead Time, it is ensured that what outside full-bridge circuit can be orderly is operated,
And upper and lower bridge arm shoot through phenomenon will not occur；
Complete the realization of control algolithm, it is ensured that whole system works under set control strategy in order；
Complete the clock distribution work of each module of whole system, control SOPC based on NiosII embedded software core processor
System, it is ensured that each sub-module of system all works under the control of clock in an orderly manner.
Further preferably, described photovoltaic grid-connected device achieve in FPGA ADPLL, AD control storage, modified model AFD,
Pwm circuit module, builds photovoltaic parallel in system IP stone based on SOPC；Build the Nios II Embedded Soft Core of completion system
Processor system, and design in NiosII development environment and debug complete mastery routine and interrupt routine and corresponding control and
Driver carrys out each module of coordinated control system.
Compared with prior art, beneficial effects of the present invention: the present invention is by carrying out structure to existing photovoltaic grid-connected device
On improvement, efficiently solve that existing photovoltaic grid-connected device system response time is slow, tracking accuracy is low, poor dynamic, can not
Or it is difficult to realize in-system programming, system job stability and poor anti jamming capability, system inefficiency, bulky asking
Topic.
Accompanying drawing explanation
Fig. 1 is the structural representation of present invention photovoltaic grid-connected device based on SOPC.
Detailed description of the invention
Technical scheme is further illustrated below in conjunction with the accompanying drawings with embodiment.
With reference to Fig. 1, a kind of photovoltaic grid-connected device based on SOPC, mainly by main circuit 1, Hall element 2, signal condition
Circuit 3, analog-digital converter 4, testing circuit 5, FPGA control module 6, drive circuit 7 are constituted:
The core of described main circuit 1 is a full-bridge inverter, mainly completes the wide scope unidirectional current exported by photovoltaic array
Inversion is sinusoidal ac, it is achieved with coupling of electrical network, the most grid-connected；
Described Hall element 2 is for gathering the DC voltage of photovoltaic array output and DC side reference instruction voltage, inverse
Become the alternating current of device output, line voltage etc. and send into signal conditioning circuit and process；
Described signal conditioning circuit 3 mainly completes the conditioning to sampled signal, i.e. amplifies, the process of filtering etc.；
Described analog-digital converter 4 realizes that collection conditioned analogue signal are converted to digital signal and sends into FPGA control
Module；
Described testing circuit 5 is for catching the zero crossing of mains voltage signal, and guarantees that inverter is defeated through phase-locked loop circuit
Going out electric current, to follow the tracks of electric network voltage phase with it Tong Bu；
Described FPGA control module 6 is the control centre of whole device, completes following control work:
Complete control and the storage of conversion data of outside A/D converter sequential, it is ensured that A/D converter is according to certain work
Make sequential external analog signal is changed；
Complete all-digital phase-locked loop control work, it is ensured that the electric current that photovoltaic parallel in system is exported is protected all the time with line voltage
Hold same frequency same phase；
Produce the waveform for building grid-connected current or for building the Active frequency drift detection side needed for island effect protection
The current waveform of method；
Complete the PWM signal generator work of band Dead Time, it is ensured that what outside full-bridge circuit can be orderly is operated,
And upper and lower bridge arm shoot through phenomenon will not occur；
Complete the realization of control algolithm, it is ensured that whole system works under set control strategy in order；
Complete the clock distribution work of each module of whole system, control SOPC based on NiosII embedded software core processor
System, it is ensured that each sub-module of system all works under the control of clock in an orderly manner；
Described drive circuit 7, for receiving the output of pwm signal generating unit in FPGA, controls merit in main circuit inverter
The turn-on and turn-off of rate MOSFET.
Further preferably, described photovoltaic grid-connected device uses full bridge inverter as system capacity conversion and control core
The heart, and use the Direct Current PI control strategy of a kind of band electrical network voltage feedforward control, eliminate grid disturbances to grid-connected
The impact of current quality, improves the tracking accuracy of system, for ensureing inverter output current energy synchronized tracking line voltage, if
Count the all-digital phase-locked loop control circuit realized based on FPGA, improve the capacity of resisting disturbance of system.
Further preferably, the FPGA control module of described photovoltaic grid-connected device uses VHDL language programming, at fpga chip
In complete following work:
Complete control and the storage of conversion data of outside A/D converter sequential, it is ensured that A/D converter is according to certain work
Make sequential external analog signal is changed；
Complete all-digital phase-locked loop control work, it is ensured that the electric current that photovoltaic parallel in system is exported is protected all the time with line voltage
Hold same frequency same phase；
Complete waveform generator work, produce for building grid-connected current waveform or protecting institute for building island effect
The current waveform of the Active frequency drift detection method needed；
Complete the PWM signal generator work of band Dead Time, it is ensured that what outside full-bridge circuit can be orderly is operated,
And upper and lower bridge arm shoot through phenomenon will not occur；
Complete the realization of control algolithm, it is ensured that whole system works under set control strategy in order；
Complete the clock distribution work of each module of whole system, control SOPC based on NiosII embedded software core processor
System, it is ensured that each sub-module of system all works under the control of clock in an orderly manner.
Further preferably, described photovoltaic grid-connected device achieve in FPGA ADPLL, AD control storage, modified model AFD,
Pwm circuit module, builds photovoltaic parallel in system IP stone based on SOPC；Build the Nios II Embedded Soft Core of completion system
Processor system, and design and debug in Nios II development environment and complete mastery routine and interrupt routine and control accordingly
And driver carrys out each module of coordinated control system, by system hardware and software collaborative work, achieving of high efficient and reliable is intended
Control target.
In main circuit, the wide scope unidirectional current of photovoltaic array output, after DC bus capacitor filtering and voltage stabilizing, is sent into complete
The input of bridge inverter, is exported by inverter bridge after transforming it into alternating current, more filtered inductance L is connected with electrical network, simultaneously
Also physical connection and between each comprising modules.
In control circuit, on the one hand, system uses Hall element respectively to inverter output current iL, electrical network two ends
Voltage Ug, DC bus capacitor both end voltage UdcAnd DC side reference instruction voltage Udc *This four roads signal is sampled, after sampling
The signal of gained is amplified through signal conditioning circuit, filter after send into the input end of analog signal of modulus converter A/D, mould
Number converter A/D changes under the work schedule of FPGA controls, and the digital signal feeding FPGA after conversion is carried out the most at last
Storage and process, and FPGA exports the feeding drive circuit generation of two-way pwm signal after a series of process and drives full-bridge inverse
Bian tetra-road pwm signal, completes the control to main circuit.On the other hand, the line voltage U after signal conditioning circuit processesg
Catch voltage zero-crossing point of power grid through zero cross detection circuit, and electrical network electricity can be obtained after sending into the ADPLL resume module in FPGA
Pressure phase angle theta, searches sine wave table by gained phase angle theta, and acquired results is total to after being multiplied with the output of unidirectional current pressure ring PI controller
With the instruction current as internal ring electric current loop, thus ensure that inverter output current all the time can the change of synchronized tracking line voltage
Change.Wherein, this locality when net side Parallel RLC Circuit is mainly used in analog systems islet operation loads.
The above, only best mode for carrying out the invention, any those familiar with the art is in the present invention
In the technical scope disclosed, the simple change of the technical scheme that can become apparent to or equivalence are replaced and are each fallen within the present invention's
In protection domain.
Claims (4)
1. a photovoltaic grid-connected device based on SOPC, it is characterised in that main by main circuit, Hall element, signal condition
Circuit, analog-digital converter, testing circuit, FPGA control module, drive circuit are constituted:
The core of described main circuit is a full-bridge inverter, mainly completes the wide scope DC inverter by photovoltaic array exports and is
Sinusoidal ac realization couples with electrical network；
Described Hall element is defeated for the DC voltage and DC side reference instruction voltage, inverter gathering photovoltaic array output
The alternating current that goes out, line voltage are also sent into signal conditioning circuit and are processed；
Described signal conditioning circuit mainly completes the conditioning to sampled signal；
Described analog-digital converter realizes that collection conditioned analogue signal are converted to digital signal and sends into FPGA control module；
Described testing circuit is for catching the zero crossing of mains voltage signal, and guarantees inverter output current through phase-locked loop circuit
Electric network voltage phase is followed the tracks of Tong Bu with it；
Described FPGA control module is the control centre of whole device, completes following control work:
Complete control and the storage of conversion data of outside A/D converter sequential, it is ensured that when A/D converter is according to certain work
Ordered pair external analog signal is changed；
Complete all-digital phase-locked loop control work, it is ensured that the electric current that photovoltaic parallel in system is exported and line voltage remain same
Frequency same phase；
Complete waveform generator work, produce for building grid-connected current waveform or needed for building island effect protection
The current waveform of Active frequency drift detection method；
Complete the PWM signal generator work of band Dead Time, it is ensured that what outside full-bridge circuit can be orderly is operated, and not
Upper and lower bridge arm shoot through phenomenon can occur；
Complete the realization of control algolithm, it is ensured that whole system works under set control strategy in order；
Complete the clock distribution work of each module of whole system, control SOPC system based on NiosII embedded software core processor
System, it is ensured that each sub-module of system all works under the control of clock in an orderly manner；
Described drive circuit, for receiving the output of pwm signal generating unit in FPGA, controls power in main circuit inverter
The turn-on and turn-off of MOSFET；
In control circuit, on the one hand, system uses described Hall element respectively to described inverter output current iL, electrical network
Voltage Ug, DC capacitor voltage UdcAnd DC side reference instruction voltage Udc* this four roads signal is sampled, gained after sampling
Signal send into after described signal conditioning circuit is amplified, filters described modulus converter A/D analogue signal input
Holding, described modulus converter A/D is changed under the work schedule of described FPGA controls, the most at last the digital signal after conversion
Sending into described FPGA to store and process, described FPGA exports two-way pwm signal after a series of process and sends into described
Drive circuit produces the four road pwm signals driving full-bridge inverting, completes the control to main circuit；On the other hand, through described signal
Line voltage U after modulate circuit processgCatch voltage zero-crossing point of power grid through zero cross detection circuit, and send in FPGA
Grid voltage phase-angle θ can be obtained after ADPLL resume module, search sine wave table, acquired results and unidirectional current by gained phase angle theta
The output of pressure ring PI controller be multiplied after collectively as the instruction current of internal ring electric current loop, thus ensure that inverter output current
All the time can the change of synchronized tracking line voltage.
Photovoltaic grid-connected device based on SOPC the most according to claim 1, it is characterised in that described photovoltaic grid-connected device is adopted
With full bridge inverter as system capacity conversion and control core, and use the direct electricity of a kind of band electrical network voltage feedforward control
Stream PI control strategy, is provided with the all-digital phase-locked loop control circuit realized based on FPGA.
Photovoltaic grid-connected device based on SOPC the most according to claim 1, it is characterised in that described photovoltaic grid-connected device
FPGA control module uses VHDL language programming, completes following work in fpga chip:
Complete control and the storage of conversion data of outside A/D converter sequential, it is ensured that when A/D converter is according to certain work
Ordered pair external analog signal is changed；
Complete all-digital phase-locked loop control work, it is ensured that the electric current that photovoltaic parallel in system is exported and line voltage remain same
Frequency same phase；
Complete waveform generator work, produce for building grid-connected current waveform or for building the master needed for island effect protection
The current waveform of dynamic shift frequency detection method；
Complete the PWM signal generator work of band Dead Time, it is ensured that what outside full-bridge circuit can be orderly is operated, and not
Upper and lower bridge arm shoot through phenomenon can occur；
Complete the realization of control algolithm, it is ensured that whole system works under set control strategy in order；
Complete the clock distribution work of each module of whole system, control SOPC system based on NiosII embedded software core processor
System, it is ensured that each sub-module of system all works under the control of clock in an orderly manner.
Photovoltaic grid-connected device based on SOPC the most according to claim 1, it is characterised in that described photovoltaic grid-connected device exists
FPGA achieves ADPLL, AD and controls storage, modified model AFD, pwm circuit module, build photovoltaic parallel in system based on SOPC
IP stone；Build the Nios II Embedded Soft Core processor system of completion system, and design also in Nios II development environment
Debugging completes mastery routine and interrupt routine and corresponding control and driver carrys out each module of coordinated control system.
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| CN104682759A (en) * | 2013-11-28 | 2015-06-03 | 哈尔滨恒誉名翔科技有限公司 | Novel three-phase inverter |
| CN108258892B (en) * | 2016-12-28 | 2020-02-28 | 致茂电子(苏州)有限公司 | Power conversion device and control method thereof |
| CN107959406A (en) * | 2017-12-05 | 2018-04-24 | 山东艾诺仪器有限公司 | The grid voltage waveform tracking system and method for Three-phase PWM Voltage Rectifier |
| CN108173287B (en) * | 2018-01-30 | 2020-02-14 | 爱士惟新能源技术(江苏)有限公司 | Control circuit and method of photovoltaic power generation system |
| CN108879782B (en) * | 2018-08-01 | 2021-11-30 | 国网重庆市电力公司电力科学研究院 | Grid-connected inverter optimization control method based on dual-filtering power grid voltage feedforward |
| CN113258808B (en) * | 2021-05-07 | 2022-12-20 | 三峡大学 | High power density vehicle AC power supply |
| CN117148022B (en) * | 2023-10-30 | 2023-12-26 | 深圳市三瑞电源有限公司 | Timing self-test system for photovoltaic energy storage inverter and test method thereof |
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